/Engine/Source/Runtime/Engine/Classes/Engine/AssetManager.h
If the given package contains a primary asset, get the packages referenced by its AssetBundleEntries. Used to inform the cook of should-be-cooked dependencies of PrimaryAssets for PrimaryAssets that are recorded in the AssetManager but have cooktype Unknown and so are not returned from ModifyCook.
virtual void ModifyCookReferences ( [FName](API\Runtime\Core\UObject\FName) PackageName, [TArray](API\Runtime\Core\Containers\TArray)< [FName](API\Runtime\Core\UObject\FName) > & PackagesToCook )